Lamp base



FIG. 1 is a perspective view of a lamp base showing our new design;

FIG. 2 is a right side elevational view of a lamp base;

FIG. 3 is a left side elevational view of a lamp base;

FIG. 4 is a rear elevational view of a lamp base; the front being a mirror image;

FIG. 5 is a top plan view of a lamp base; and,

FIG. 6 is a bottom plan view of a lamp base.

The shade shown in broken lines is for illustrative purposes only. 

The ornamental design for a lamp base, as shown and described. 